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  <div class="section" id="module-smtpd">
<span id="smtpd-smtp-server"></span><h1>21.18. <a class="reference internal" href="#module-smtpd" title="smtpd: A SMTP server implementation in Python."><tt class="xref py py-mod docutils literal"><span class="pre">smtpd</span></tt></a> &#8212; SMTP Server<a class="headerlink" href="#module-smtpd" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://hg.python.org/cpython/file/3.4/Lib/smtpd.py">Lib/smtpd.py</a></p>
<hr class="docutils" />
<p>This module offers several classes to implement SMTP (email) servers.</p>
<p>Several server implementations are present; one is a generic
do-nothing implementation, which can be overridden, while the other two offer
specific mail-sending strategies.</p>
<p>Additionally the SMTPChannel may be extended to implement very specific
interaction behaviour with SMTP clients.</p>
<p>The code supports <span class="target" id="index-0"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc5321.html"><strong>RFC 5321</strong></a>, plus the <span class="target" id="index-1"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc1870.html"><strong>RFC 1870</strong></a> SIZE extension.</p>
<div class="section" id="smtpserver-objects">
<h2>21.18.1. SMTPServer Objects<a class="headerlink" href="#smtpserver-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="smtpd.SMTPServer">
<em class="property">class </em><tt class="descclassname">smtpd.</tt><tt class="descname">SMTPServer</tt><big>(</big><em>localaddr</em>, <em>remoteaddr</em>, <em>data_size_limit=33554432</em>, <em>map=None</em><big>)</big><a class="headerlink" href="#smtpd.SMTPServer" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a> object, which binds to local address
<em>localaddr</em>.  It will treat <em>remoteaddr</em> as an upstream SMTP relayer.  It
inherits from <a class="reference internal" href="asyncore.html#asyncore.dispatcher" title="asyncore.dispatcher"><tt class="xref py py-class docutils literal"><span class="pre">asyncore.dispatcher</span></tt></a>, and so will insert itself into
<a class="reference internal" href="asyncore.html#module-asyncore" title="asyncore: A base class for developing asynchronous socket handling services."><tt class="xref py py-mod docutils literal"><span class="pre">asyncore</span></tt></a>&#8216;s event loop on instantiation.</p>
<p><em>data_size_limit</em> specifies the maximum number of bytes that will be
accepted in a <tt class="docutils literal"><span class="pre">DATA</span></tt> command.  A value of <tt class="docutils literal"><span class="pre">None</span></tt> or <tt class="docutils literal"><span class="pre">0</span></tt> means no
limit.</p>
<p>A dictionary can be specified in <em>map</em> to avoid using a global socket map.</p>
<dl class="method">
<dt id="smtpd.SMTPServer.process_message">
<tt class="descname">process_message</tt><big>(</big><em>peer</em>, <em>mailfrom</em>, <em>rcpttos</em>, <em>data</em><big>)</big><a class="headerlink" href="#smtpd.SMTPServer.process_message" title="Permalink to this definition">¶</a></dt>
<dd><p>Raise <a class="reference internal" href="exceptions.html#NotImplementedError" title="NotImplementedError"><tt class="xref py py-exc docutils literal"><span class="pre">NotImplementedError</span></tt></a> exception. Override this in subclasses to
do something useful with this message. Whatever was passed in the
constructor as <em>remoteaddr</em> will be available as the <tt class="xref py py-attr docutils literal"><span class="pre">_remoteaddr</span></tt>
attribute. <em>peer</em> is the remote host&#8217;s address, <em>mailfrom</em> is the envelope
originator, <em>rcpttos</em> are the envelope recipients and <em>data</em> is a string
containing the contents of the e-mail (which should be in <span class="target" id="index-2"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc2822.html"><strong>RFC 2822</strong></a>
format).</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPServer.channel_class">
<tt class="descname">channel_class</tt><a class="headerlink" href="#smtpd.SMTPServer.channel_class" title="Permalink to this definition">¶</a></dt>
<dd><p>Override this in subclasses to use a custom <a class="reference internal" href="#smtpd.SMTPChannel" title="smtpd.SMTPChannel"><tt class="xref py py-class docutils literal"><span class="pre">SMTPChannel</span></tt></a> for
managing SMTP clients.</p>
</dd></dl>

<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.4: </span>The <em>map</em> argument was added.</p>
</div>
</dd></dl>

</div>
<div class="section" id="debuggingserver-objects">
<h2>21.18.2. DebuggingServer Objects<a class="headerlink" href="#debuggingserver-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="smtpd.DebuggingServer">
<em class="property">class </em><tt class="descclassname">smtpd.</tt><tt class="descname">DebuggingServer</tt><big>(</big><em>localaddr</em>, <em>remoteaddr</em><big>)</big><a class="headerlink" href="#smtpd.DebuggingServer" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new debugging server.  Arguments are as per <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a>.
Messages will be discarded, and printed on stdout.</p>
</dd></dl>

</div>
<div class="section" id="pureproxy-objects">
<h2>21.18.3. PureProxy Objects<a class="headerlink" href="#pureproxy-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="smtpd.PureProxy">
<em class="property">class </em><tt class="descclassname">smtpd.</tt><tt class="descname">PureProxy</tt><big>(</big><em>localaddr</em>, <em>remoteaddr</em><big>)</big><a class="headerlink" href="#smtpd.PureProxy" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new pure proxy server. Arguments are as per <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a>.
Everything will be relayed to <em>remoteaddr</em>.  Note that running this has a good
chance to make you into an open relay, so please be careful.</p>
</dd></dl>

</div>
<div class="section" id="mailmanproxy-objects">
<h2>21.18.4. MailmanProxy Objects<a class="headerlink" href="#mailmanproxy-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="smtpd.MailmanProxy">
<em class="property">class </em><tt class="descclassname">smtpd.</tt><tt class="descname">MailmanProxy</tt><big>(</big><em>localaddr</em>, <em>remoteaddr</em><big>)</big><a class="headerlink" href="#smtpd.MailmanProxy" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new pure proxy server. Arguments are as per <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a>.
Everything will be relayed to <em>remoteaddr</em>, unless local mailman configurations
knows about an address, in which case it will be handled via mailman.  Note that
running this has a good chance to make you into an open relay, so please be
careful.</p>
</dd></dl>

</div>
<div class="section" id="smtpchannel-objects">
<h2>21.18.5. SMTPChannel Objects<a class="headerlink" href="#smtpchannel-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="smtpd.SMTPChannel">
<em class="property">class </em><tt class="descclassname">smtpd.</tt><tt class="descname">SMTPChannel</tt><big>(</big><em>server</em>, <em>conn</em>, <em>addr</em>, <em>data_size_limit=33554432</em>, <em>map=None)</em><big>)</big><a class="headerlink" href="#smtpd.SMTPChannel" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new <a class="reference internal" href="#smtpd.SMTPChannel" title="smtpd.SMTPChannel"><tt class="xref py py-class docutils literal"><span class="pre">SMTPChannel</span></tt></a> object which manages the communication
between the server and a single SMTP client.</p>
<p><em>conn</em> and <em>addr</em> are as per the instance variables described below.</p>
<p><em>data_size_limit</em> specifies the maximum number of bytes that will be
accepted in a <tt class="docutils literal"><span class="pre">DATA</span></tt> command.  A value of <tt class="docutils literal"><span class="pre">None</span></tt> or <tt class="docutils literal"><span class="pre">0</span></tt> means no
limit.</p>
<p>A dictionary can be specified in <em>map</em> to avoid using a global socket map.</p>
<p>To use a custom SMTPChannel implementation you need to override the
<a class="reference internal" href="#smtpd.SMTPServer.channel_class" title="smtpd.SMTPServer.channel_class"><tt class="xref py py-attr docutils literal"><span class="pre">SMTPServer.channel_class</span></tt></a> of your <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a>.</p>
<p>The <a class="reference internal" href="#smtpd.SMTPChannel" title="smtpd.SMTPChannel"><tt class="xref py py-class docutils literal"><span class="pre">SMTPChannel</span></tt></a> has the following instance variables:</p>
<dl class="attribute">
<dt id="smtpd.SMTPChannel.smtp_server">
<tt class="descname">smtp_server</tt><a class="headerlink" href="#smtpd.SMTPChannel.smtp_server" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the <a class="reference internal" href="#smtpd.SMTPServer" title="smtpd.SMTPServer"><tt class="xref py py-class docutils literal"><span class="pre">SMTPServer</span></tt></a> that spawned this channel.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.conn">
<tt class="descname">conn</tt><a class="headerlink" href="#smtpd.SMTPChannel.conn" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the socket object connecting to the client.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.addr">
<tt class="descname">addr</tt><a class="headerlink" href="#smtpd.SMTPChannel.addr" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the address of the client, the second value returned by
<a class="reference internal" href="socket.html#socket.socket.accept" title="socket.socket.accept"><tt class="xref py py-func docutils literal"><span class="pre">socket.accept</span></tt></a></p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.received_lines">
<tt class="descname">received_lines</tt><a class="headerlink" href="#smtpd.SMTPChannel.received_lines" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds a list of the line strings (decoded using UTF-8) received from
the client. The lines have their <tt class="docutils literal"><span class="pre">&quot;\r\n&quot;</span></tt> line ending translated to
<tt class="docutils literal"><span class="pre">&quot;\n&quot;</span></tt>.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.smtp_state">
<tt class="descname">smtp_state</tt><a class="headerlink" href="#smtpd.SMTPChannel.smtp_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the current state of the channel. This will be either
<tt class="xref py py-attr docutils literal"><span class="pre">COMMAND</span></tt> initially and then <tt class="xref py py-attr docutils literal"><span class="pre">DATA</span></tt> after the client sends
a &#8220;DATA&#8221; line.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.seen_greeting">
<tt class="descname">seen_greeting</tt><a class="headerlink" href="#smtpd.SMTPChannel.seen_greeting" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds a string containing the greeting sent by the client in its &#8220;HELO&#8221;.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.mailfrom">
<tt class="descname">mailfrom</tt><a class="headerlink" href="#smtpd.SMTPChannel.mailfrom" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds a string containing the address identified in the &#8220;MAIL FROM:&#8221; line
from the client.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.rcpttos">
<tt class="descname">rcpttos</tt><a class="headerlink" href="#smtpd.SMTPChannel.rcpttos" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds a list of strings containing the addresses identified in the
&#8220;RCPT TO:&#8221; lines from the client.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.received_data">
<tt class="descname">received_data</tt><a class="headerlink" href="#smtpd.SMTPChannel.received_data" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds a string containing all of the data sent by the client during the
DATA state, up to but not including the terminating <tt class="docutils literal"><span class="pre">&quot;\r\n.\r\n&quot;</span></tt>.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.fqdn">
<tt class="descname">fqdn</tt><a class="headerlink" href="#smtpd.SMTPChannel.fqdn" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the fully-qualified domain name of the server as returned by
<a class="reference internal" href="socket.html#socket.getfqdn" title="socket.getfqdn"><tt class="xref py py-func docutils literal"><span class="pre">socket.getfqdn()</span></tt></a>.</p>
</dd></dl>

<dl class="attribute">
<dt id="smtpd.SMTPChannel.peer">
<tt class="descname">peer</tt><a class="headerlink" href="#smtpd.SMTPChannel.peer" title="Permalink to this definition">¶</a></dt>
<dd><p>Holds the name of the client peer as returned by <tt class="docutils literal"><span class="pre">conn.getpeername()</span></tt>
where <tt class="docutils literal"><span class="pre">conn</span></tt> is <a class="reference internal" href="#smtpd.SMTPChannel.conn" title="smtpd.SMTPChannel.conn"><tt class="xref py py-attr docutils literal"><span class="pre">conn</span></tt></a>.</p>
</dd></dl>

<p>The <a class="reference internal" href="#smtpd.SMTPChannel" title="smtpd.SMTPChannel"><tt class="xref py py-class docutils literal"><span class="pre">SMTPChannel</span></tt></a> operates by invoking methods named <tt class="docutils literal"><span class="pre">smtp_&lt;command&gt;</span></tt>
upon reception of a command line from the client. Built into the base
<a class="reference internal" href="#smtpd.SMTPChannel" title="smtpd.SMTPChannel"><tt class="xref py py-class docutils literal"><span class="pre">SMTPChannel</span></tt></a> class are methods for handling the following commands
(and responding to them appropriately):</p>
<table border="1" class="docutils">
<colgroup>
<col width="11%" />
<col width="89%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Command</th>
<th class="head">Action taken</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>HELO</td>
<td>Accepts the greeting from the client and stores it in
<a class="reference internal" href="#smtpd.SMTPChannel.seen_greeting" title="smtpd.SMTPChannel.seen_greeting"><tt class="xref py py-attr docutils literal"><span class="pre">seen_greeting</span></tt></a>.  Sets server to base command mode.</td>
</tr>
<tr class="row-odd"><td>EHLO</td>
<td>Accepts the greeting from the client and stores it in
<a class="reference internal" href="#smtpd.SMTPChannel.seen_greeting" title="smtpd.SMTPChannel.seen_greeting"><tt class="xref py py-attr docutils literal"><span class="pre">seen_greeting</span></tt></a>.  Sets server to extended command mode.</td>
</tr>
<tr class="row-even"><td>NOOP</td>
<td>Takes no action.</td>
</tr>
<tr class="row-odd"><td>QUIT</td>
<td>Closes the connection cleanly.</td>
</tr>
<tr class="row-even"><td>MAIL</td>
<td>Accepts the &#8220;MAIL FROM:&#8221; syntax and stores the supplied address as
<a class="reference internal" href="#smtpd.SMTPChannel.mailfrom" title="smtpd.SMTPChannel.mailfrom"><tt class="xref py py-attr docutils literal"><span class="pre">mailfrom</span></tt></a>.  In extended command mode, accepts the
<span class="target" id="index-3"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc1870.html"><strong>RFC 1870</strong></a> SIZE attribute and responds appropriately based on the
value of <em>data_size_limit</em>.</td>
</tr>
<tr class="row-odd"><td>RCPT</td>
<td>Accepts the &#8220;RCPT TO:&#8221; syntax and stores the supplied addresses in
the <a class="reference internal" href="#smtpd.SMTPChannel.rcpttos" title="smtpd.SMTPChannel.rcpttos"><tt class="xref py py-attr docutils literal"><span class="pre">rcpttos</span></tt></a> list.</td>
</tr>
<tr class="row-even"><td>RSET</td>
<td>Resets the <a class="reference internal" href="#smtpd.SMTPChannel.mailfrom" title="smtpd.SMTPChannel.mailfrom"><tt class="xref py py-attr docutils literal"><span class="pre">mailfrom</span></tt></a>, <a class="reference internal" href="#smtpd.SMTPChannel.rcpttos" title="smtpd.SMTPChannel.rcpttos"><tt class="xref py py-attr docutils literal"><span class="pre">rcpttos</span></tt></a>, and
<a class="reference internal" href="#smtpd.SMTPChannel.received_data" title="smtpd.SMTPChannel.received_data"><tt class="xref py py-attr docutils literal"><span class="pre">received_data</span></tt></a>, but not the greeting.</td>
</tr>
<tr class="row-odd"><td>DATA</td>
<td>Sets the internal state to <tt class="xref py py-attr docutils literal"><span class="pre">DATA</span></tt> and stores remaining lines
from the client in <a class="reference internal" href="#smtpd.SMTPChannel.received_data" title="smtpd.SMTPChannel.received_data"><tt class="xref py py-attr docutils literal"><span class="pre">received_data</span></tt></a> until the terminator
<tt class="docutils literal"><span class="pre">&quot;\r\n.\r\n&quot;</span></tt> is received.</td>
</tr>
<tr class="row-even"><td>HELP</td>
<td>Returns minimal information on command syntax</td>
</tr>
<tr class="row-odd"><td>VRFY</td>
<td>Returns code 252 (the server doesn&#8217;t know if the address is valid)</td>
</tr>
<tr class="row-even"><td>EXPN</td>
<td>Reports that the command is not implemented.</td>
</tr>
</tbody>
</table>
</dd></dl>

</div>
</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">21.18. <tt class="docutils literal"><span class="pre">smtpd</span></tt> &#8212; SMTP Server</a><ul>
<li><a class="reference internal" href="#smtpserver-objects">21.18.1. SMTPServer Objects</a></li>
<li><a class="reference internal" href="#debuggingserver-objects">21.18.2. DebuggingServer Objects</a></li>
<li><a class="reference internal" href="#pureproxy-objects">21.18.3. PureProxy Objects</a></li>
<li><a class="reference internal" href="#mailmanproxy-objects">21.18.4. MailmanProxy Objects</a></li>
<li><a class="reference internal" href="#smtpchannel-objects">21.18.5. SMTPChannel Objects</a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="smtplib.html"
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  <p class="topless"><a href="telnetlib.html"
                        title="next chapter">21.19. <tt class="docutils literal"><span class="pre">telnetlib</span></tt> &#8212; Telnet client</a></p>
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